Process for preparing hair to be worked into felt



Patented Oct. 14, 1930 UNITED STATES;

' PATENT OFFICE- HEDTBIGH WAGNER, IRANKFOBT-OH-THE-nm, GERMANY, ASSIGNOR TO I. G. IABBENINDUSTBIE .AKTIENGEBELLSCHAIT, OF IBANKIOBT-ON-THEIAIN, enn- IANY, A. CORPORATION OF GERMANY v PROCESS FOR LIEREYABING HAIR TO BE WORKED INTO FELT Io Drawing. Application fled larch 26, 1926, Serial Ho. 97,779, and in Germany April 8, 1m.

It is known that it is the practice in the manufacture of hats from hair to impregnate theunprepared rabbit and hare skins with posed for this purpose solutions'of iron, an

solutions of nitrate of mercury, in order to increase the felting property of the hair.

vThe said mercury solutions are, however, extremely poisonous and in applying them with brushes the workmen handling them are spattered therewith. I

Now, several. ttempts have already been made to find a substitute for'the said poisonous mercury solution and there were protirnony, potassium, sodium, tin or the like in nitric acid or sulfuric acid. From hair impregnated with these salts it was, indeed, possible to produce a felt, which, however, was

not sufliciently firm and compact.

I have now found that an excellent felt can-be obtained by treating the skins with solutions of metallic salts, such as bismuth nitrate, zinc nitrate and aluminum nitrate, to which have been added such bodies as are adapted for use as wetting agents generally. Among the bodies in question the organic sulfonic acids of higher molecular weight, particularly the sulfonic acids of aryl-, aralkylor alkyl-naphthalenes, have proved to be very' useful for the purpose in' question. These lattersulfonic acid compounds may be designated as sulfonicacids of organiccompounds having the general formula R-X,

wherein It represents a naphthalene residue and X represents one of the groups alkyl, aryl and aralkyl.

The following examples serve to illustrate my invention:

1. 500 grams of bismuth nitrate are treated with 1000 0.0. of concentrated nitric acid of 40 40 B. and the liquor is made up with water of ordinary temperature to 10 litres. To this solution are added .100 grams of benzylna hthalenesulfonic acid,. the latter being dissolved by stirring in the cold. The skins are then brushed over with-the said composition in the usual manner and dried.

2. 500 grams of zinc nitrate and 100 grams V of zinc chloride are treated with 1100 (ac. of

nitric acid of 40 B. and made up with water to 10 litres. To this solution are added .150

grams of benzylnaphthalenesulfonic acid.-

The skins are brushed over in the usual man- 5 litres; there are then added thereto 100' gaams of sodium alkylnaphthylsulfonate.

hen the last mentioned product has dissolved, the skins are brushed over with the composition in the usual manner and dried.

4. 500 grams of bismuth nitrate are treated with 1100 0.0. of concentrated nitric acid and the liquor is made up with water of ordinary temperature to 4 litres. To this solution is added a solution of 10 grams of sodium nitrite in 100 cc. of water and the whole is made up to 5 litres. To the liquor are added 100 acid and the skins are brushed over with the composition in theusual manner.

I claim:

grams of benzylnaphthalene sulfonic 1. In processes for the preparatien- ""o'f hair to be worked into felt, the step which con sists in treating the hair to be felted with a solution comprising bismuth nitrate and a sulfonic acid of a naphthalene compound.

2'. In processes for the preparation of hair to be worked into felt, the step which consists in treating the hair to be felted with a solution comprising bismuth nitrate and a sulfonic aci of an organic'compound having the general formula: RX wherein R represents a naphthalene residue and X represents one of the groups alkyl, aryl and aralkyl.

3. As a new composition of matter, a preparation to be used in working hair into felt containing bismuth nitrate and a sulfonic containing bismuth nitrate and a sulfonic acid of anor anic compound having the general form a: R-X wherein R represents a naphthalene residue and X represents one of the groups alkyl, aryl and aralkyl.

5. In processes for the reparation of hair who worked into felt, t e step which consists in treating the hair to he felted with a solution of a compound of the, following formula Y. N wherein Y stands for aluminum or ismuth said solution oontainmg also a sulfonic aci of a naphthalene compound. Y 6. In processes forthe reparation of hair to be-worked into felt, the step which consists in treating the hair to be felted with a solution of a compound of the following formula: Y.(N( wherein Y stands for aluminum or bismuth, said solution containirig also a sulfonic acid of an organic compound havingthe general formula: RX wherein R represents a naphthalene residue and X represents one,of the groups alkyl, argl and aralkyl. v As a new composition of matter, a preparation to be used in working hair into. felt containing a compound having tlie following formula: Y. QT 0 wherein Y stands for aluminum or ismuth, and a sulfonic acid of a naphthalene residue. 8. As a new composition of matter, a preparation to be used in working hair into felt containing a compound having thefollowing formula: Y.(NO wherein Y stands for aluminum or bismuth, and a sulfonic acid of an organic compound having the general formula Re-X wherein It represents a naphthalene residue and X re resentsone of the groups alkyl, aryl and araIkyl.

In testimony whereof, I aflix my si ature. Dn. HEINRICH WAG R. as a v 

